Concrete-mixer.



No. 670,222.' Patented mar. |9,'|9o|.

H. CAMPBELL.

GGNGRETE MIXER. (Application med me. 26, 190m (No Model.)

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lilivrThn STaTns PATENT Trice.

HOWARD CAMPBELL, OF BROOKLYN, NEW YORK.

CONCRETE-MIXER.

SPECIFICATION forming part of Letters Patent NO. 670,222, dated March19, 1901.

Application filed December 20, 1900. Serial No. 40,496. (No model.)

To all whom it' may concern/.-

Be it known that I, HOWARD CAMPBELL, a citizen o'f the United States,residing at the borough of Brooklyn, city and State of New York, haveinvented a new and useful Improvement in Concrete-Mixers, of which thefollowing is a specification.

The object of my invention is to provide a device to thoroughly mix thecomponent 'consist of an elongated rotating box into which theingredients are shoveled, said box having staggered shelves on itsopposite sides and set at an inclination. The ingredients being shoveledin at the top of these mixers merely roll from one shelf to another, andso on through the mixer, sometimes passing through cross-bars to makethe mixing more thorough. These mixers are apt to clog with very littleservice and are not generally efflcient.

My device comprises an elongated shell, preferably of rectangularcrosssection and set vertically. The upper part, into which the concreteingredients are shoveled, is hopper-shaped, and the bottom is tapered inorder that the concrete may be brought together before leaving themixer. Inside the shell I provide inclined staggered deiiectors, withwhich the concrete comes in contact. These deiectors are secured to rodspassing through the shell. The sides oi' the shell adjacent to the rodsand above the deectors are turned in to form a stop for said deectors. Ialso provide a spring for every deiector to keep the same in bearingwith said stops. As the ingredients in their descent strike thesedeiiectors they are borne down and then react, moving back to positionby the action of the springs, and by this reaction the ingredients arethrown upward and toward the opposite side of the mixer and are notallowed merely to roll from one defiector to another through the mixerby gravity. The details of construction and the automatic Water-supplywill be hereinafter more particularly set forth.

In the drawings, Figure l is a front elevation and partial section ofthe mixer. Fig. 2 is an elevation and partial section of the side of themixer. Fig. 3 is an enlarged plan View of one series of shelves.

a represents the elongated shell, preferably of rectangularcross-section. At staggered intervals on the opposite narrow sides otthe mixer the shell is bent in at ct. Below this portion a the samenarrow side is rolled in, as at d2, leaving a small space between thelower part of ct and the upper part of (t2. The deliectors l) aresecured to rods c by hinges or otherwise, the rods c being supported bysuitable bearings c', which latter are secured to the Wide sides of theshell. The detlectors b and rods c are so placed that in their normalposition the detlectors bear upon the lower ends of the bent-in partsct'. Beneath the rod c and supported in the same bearing I employ rodsd. Around these rods are springs d, one for every deliector, one end ofthe springs being attached to the rods d and the other ends passingthrough slots in the portions a2 of the shell and brought to bear on theunder sides of the deilectors. One end of each rod d passes through thefront of the shell and carries a ratchet e, having a pawl adapted toengage the same. It will be apparent from this construction that anydesired tension may be brought to bear upon the detlectors b through thesprings d, the lower portions a of the shell forming stops for thedeflectors.

The portions CL2 of the narrow sides of the shell may be rolled in andextended, so as to leave sufficient space for the deflectors to movedown and have suicient play, the parts CL2 having slots for the springsd' to pass through. It will be noticed by, this construction that theessential parts of the springs and the parts supporting and upon whichthe deilectors swing are amply protected from contact with the concreteingredients as they pass through the mixer, the

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part of the shell a forming a shield above them and the part a2 forminga protector against those parts of the concrete ingre.- dients which maybe thrown up from the next defiectors below. I-Ience the tendency toclog is reduced to a minimum. By this construction the springs and theirsupports and the supports for the deflectors are also on the ontside ofthe shell, which is a feature of no smallimprtance and conveniencein thematter of repairs.

The upper or first deflector h I prefer to make integral with lthe shelld. All the other defiectors are arranged as described, and as manyseries ot' them may be employed as is necessary to a thorough mixing ofthe ingredients.

A pipe 7L conveys the necessary water to the mixer. This pipe terminatesin the center of the mixer above the shelf D in a nozzle or sprayer Z.In the pipe h and in asuitable position outside the shell is a valve t',whose valve-stem carries a lever fm. To the upper series of defiectorsl? I secure an arm fn. The lever m and the arm fn, are connected by thelink r. In the normal position, as shown, the valve is closed; but whenthe deflectors of the upper series are depressed the valve is openedthrough lever fm, link r, and arm n, and water is permitted to escapeinto the mixer. The valve is closed again as soon as the deiectorsreturn to the normal position.

At u I have shown a plat-form from which the component parts areshoveled into the mixer and at o a platform below on which the concreteis received after being mixed.

The apparatus may be supported in any suitable manner, no means ofsupport being shown in the drawings, as the same forms no part of myinvention.

In the operation of the apparatus the mixed ingredients are shoveledfrom the platform u into the hopper at the top of the shell and fallfirst against the fixed detlector b and roll down and fall against thetop series of deflectors h, depressing the same,opening the valve, andletting water into the mixer. As these deiiectors spring back intoposition afterimpact they throw the ingredients which caused theirdeflection up and over to the other side of the shell, where theingredients fall to the next series of deflectors, this operation beingrepeated with each series of deflectors until the concrete passes out,mixed, to the platform o.

I claim as my invention 1. In an apparatus for mixing concrete andsimilar materials the combination with a rectangular shell, of inclinedpivotally-mounted and automatically-movable deflectors for arresting thefall of the materials and diverting the same from side to side as theypass through the shell, substantially as and for the purposes set forth.

2. In an apparatus for mixing concrete, and similar materials, and incombination, an

elongated shell, means for automatically and alternately deflecling andthrowing theingredients to be mixed, from one side of the shell to theother as said ingredients gravitate through the shell, and means forautomatically supplying water to the said ingredients as they passthrough the mixer, substantially as specified.

3. In an apparatus for mixing concrete, and similar materials, thecombination with an elongated rectangular shell, of aseries of piv oteddeflectors on opposite sides of the shell occupying a staggered relationto one another within the shell, springs below said defiectors,variable-tension devices to which one end of each of said springs isfastened the other ends passing through slots in the shell and bearingagainst said deflectors tending to elevate the same and cause thedefiectors t-o bear upon the lower part of a bent-in portion of theshell, and means for automatically supplying the necessary water to theconcrete mixture, substantially as set forth.

4. In an apparatus for mixing concrete, and similar materials, thecombination with an elongated rectangular shell, of a series ofstaggered, downwardly-inclined defiectors, springs beneath saiddeflectors to produce an upward pressure against the same, rods passingthrough said shell at one end and to which one end of said springs areattached, ratchets on said rods outside the shell, and pawls adapted toengage said ratchets whereby the tension in the springs may be varied,and means for automatically supplying the water necessary to themixture, substantially as set forth.

5. An apparatus for mixing concrete and similar materials comprising anelongated rectangular shell having opposite bent-in sides atspaced-apart staggered intervals, where there are elongated spaces andopenings, a series of inclined deiiectors extending through theopenings, rods extending across said spaces and on which the defiectorsare pivotally mounted, means for holding said deflectors against thelower end of said bentin portions of the shell and means for varying thepressure against the same; a pipe extending into the shell, a nozzle, atthe inner end of the pipe, a valve in said pipe, an arm secured to theupper series of deflectors, a link and lever for connecting thedeflectors to the valve-stem of said valve so placed that when saiddeflectors are depressed the valve is opened and water allowed to escapeinto the mixer, substantially as and for the purposes set forth.

6. An apparatus for mixing concrete and similar materials comprising anelongated rectangular shell having opposite bent in sides atspaced-apart staggered intervals, where there are elongated spaces andopenings, a series of inclined deflectors extending through theopenings, rods extending across said spaces and on which the deiiectorsare pivotally mounted, a series of springs each ZOO IIO

to the valve-,stein of said valve, so placed that when said deleetorsare depressed the Valve is opened and Water allowed to escape into themixer, substantially as and for the purposes set forth.

Signed by lne this 18th day of December, 1900.

HOWARD CAMPBELL.

Witnesses:

GEO. T. PINCKNEY, BERTHA M. ALLEN.

